Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 80 · 40 questions

The method (Round, then calculate): Round each number to the nearest ten, hundred or whole number. Do the easy sum with the rounded numbers. Pick the option nearest to it. To round a number, look at the digit after the place you keep: 5 or more goes up, less than 5 stays.

1. 1.Which is closest to 100 + 300 + 403? (a) 800 (b) 900 (c) 700 (d) 1000
2. 2.Round 64.19 to one decimal place. =
3. 3.Round 83.18 to one decimal place. =
4. 4.Round 19146 to the nearest hundred.
5. 5.Which is closest to 801 × 30? (Round each number first.) (a) 2400 (b) 240000 (c) 24000 (d) 48000
6. 6.Which is closest to 299 × 18? (Round each number first.) (a) 60000 (b) 600 (c) 6000 (d) 12000
7. 7.Round 53.33 to one decimal place. =
8. 8.Which is closest to 296 + 901 + 603? (a) 1900 (b) 1800 (c) 2000 (d) 1700
9. 9.Which is closest to 199 × 21? (Round each number first.) (a) 400 (b) 8000 (c) 40000 (d) 4000
10. 10.Which is closest to 496 × 31? (Round each number first.) (a) 30000 (b) 150000 (c) 15000 (d) 1500
11. 11.Which is closest to 296 × 21? (Round each number first.) (a) 600 (b) 60000 (c) 6000 (d) 12000
12. 12.Which is closest to 202 × 39? (Round each number first.) (a) 8000 (b) 80000 (c) 16000 (d) 800
13. 13.Which is closest to 899 ÷ 29? (a) 60 (b) 300 (c) 15 (d) 30
14. 14.Which is closest to 593 ÷ 29? (a) 40 (b) 10 (c) 20 (d) 200
15. 15.Which is closest to 299 + 104 + 702? (a) 1200 (b) 1300 (c) 1000 (d) 1100
16. 16.Which is closest to 800 × 88? (Round each number first.) (a) 7200 (b) 72000 (c) 144000 (d) 720000
17. 17.Which is closest to 204 + 703 + 696? (a) 1700 (b) 1800 (c) 1500 (d) 1600
18. 18.Which is closest to 599 × 18? (Round each number first.) (a) 24000 (b) 1200 (c) 12000 (d) 120000
19. 19.Which is closest to 2796 ÷ 41? (a) 140 (b) 70 (c) 700 (d) 35
20. 20.Round 49.09 to one decimal place. =
21. 21.Which is closest to 397 × 38? (Round each number first.) (a) 1600 (b) 160000 (c) 16000 (d) 32000
22. 22.Which is closest to 398 × 61? (Round each number first.) (a) 2400 (b) 240000 (c) 24000 (d) 48000
23. 23.Round 58523 to the nearest thousand.
24. 24.Which is closest to 598 × 29? (Round each number first.) (a) 18000 (b) 36000 (c) 1800 (d) 180000
25. 25.Round 21.08 to one decimal place. =
26. 26.Which is closest to 800 + 495 + 404? (a) 1800 (b) 1600 (c) 1900 (d) 1700
27. 27.Round 60579 to the nearest thousand.
28. 28.Which is closest to 98 + 496 + 300? (a) 900 (b) 1100 (c) 1000 (d) 800
29. 29.Round 17.84 to one decimal place. =
30. 30.Which is closest to 199 × 42? (Round each number first.) (a) 80000 (b) 8000 (c) 800 (d) 16000
31. 31.Which is closest to 202 × 70? (Round each number first.) (a) 28000 (b) 1400 (c) 14000 (d) 140000
32. 32.Which is closest to 597 × 32? (Round each number first.) (a) 36000 (b) 1800 (c) 18000 (d) 180000
33. 33.Which is closest to 4000 ÷ 51? (a) 800 (b) 40 (c) 160 (d) 80
34. 34.Round 79325 to the nearest thousand.
35. 35.Which is closest to 195 + 601 + 598? (a) 1400 (b) 1600 (c) 1300 (d) 1500
36. 36.Which is closest to 905 + 95 + 96? (a) 1200 (b) 1000 (c) 1100 (d) 1300
37. 37.Which is closest to 795 ÷ 21? (a) 80 (b) 20 (c) 40 (d) 400
38. 38.Which is closest to 604 × 50? (Round each number first.) (a) 300000 (b) 3000 (c) 30000 (d) 60000
39. 39.Which is closest to 302 + 899 + 803? (a) 2200 (b) 2000 (c) 2100 (d) 1900
40. 40.Round 83.52 to one decimal place. =

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